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[PersistenceUnit: exam-entity] Unable to build EntityManagerFactory
javax.persistence.PersistenceException: [PersistenceUnit: Eclipselink_JPA] Unable to build EntityManagerFactory at org.jboss.as.jpa.service.PersistenceUnitServiceImpl$1.run(PersistenceUnitServiceImpl.java:103) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)[rt.jar:1.8.0_102] at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)[rt.jar:1.8.0_102] at java.lang.Thread.run(Unknown Source)[rt.jar:1.8.0_102] at org.jboss.threads.JBossThread.run(JBossThread.java:122)[jboss-threads-2.1.2.Final-redhat-1.jar:2.1.2.Final-redhat-1]Caused by: javax.persistence.PersistenceException: [PersistenceUnit: Eclipselink_JPA] Unable to build EntityManagerFactory at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:925) at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:900) at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:76) at org.jboss.as.jpa.service.PersistenceUnitServiceImpl.createContainerEntityManagerFactory(PersistenceUnitServiceImpl.java:200) at org.jboss.as.jpa.service.PersistenceUnitServiceImpl.access$600(PersistenceUnitServiceImpl.java:57) at org.jboss.as.jpa.service.PersistenceUnitServiceImpl$1.run(PersistenceUnitServiceImpl.java:99) ... 4 moreCaused by: org.hibernate.HibernateException: Connection cannot be null when 'hibernate.dialect' not set at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:98) at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:68) at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:174) at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:85) at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:184) at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:156) at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1827) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1785) at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:96) at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:915) ... 9 more